Your comfort starts by maintaining your core body temperature. 
 
Which is why we spent two years developing our DELTA thermoregulating Base Layer powered by 37.5® technology. As you get hot or cold your body has to work to try to regulate your core temperature. That takes energy; the more your core temperature fluctuates the more energy you expend, the more tired you feel—this tech is scientifically proven to decrease the rate of core temperature fluctuations increasing your efficiency by up to 28%. Also, DELTA fabric traps odor molecules and releases them in the wash keeping you feeling fresh longer.
 
The Addison ½ Sleeve Base Layer Top is designed to work in both hot and cold environments. You don’t have time to worry being comfortable, you just have to be—no matter the conditions. The half-sleeve provides coverage to just below the bicep leaving your lower arms uncovered. The style has a crew neck and dropped rear hem that stays tucked into pants as well as engineered underarm gussets that ensure hassle-free range of motion. We are proud that this garment is manufactured in our hometown of Baltimore MD!